iOS 鑰匙串相關操作

這兩天閒下來，整理了一下之前的項目，看到這個工具類，拿出來分享一下。鑰匙串操作工具類，實現鑰匙串的存儲，讀取，刪除操作。

直接上代碼：

//
//  KeyChainStore.h
//  GeXiaZi
//
//  Created by Coyote on 16/10/18.
//  Copyright © 2016年 apple. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface KeyChainStore : NSObject


/**
 *  將數據存儲到鑰匙串
 *  service : 字段名
 *  data : 存儲內容
 */
+ (void)save:(NSString *)service data:(id)data;

/**
 *  從鑰匙串中讀取數據
 *  service : 字段名
 */
+ (id)load:(NSString *)service;

/**
 *  刪除鑰匙串中的數據
 *  service : 字段名
 */
+ (void)deleteKeyData:(NSString *)service;

@end

//
//  KeyChainStore.m
//  GeXiaZi
//
//  Created by Coyote on 16/10/18.
//  Copyright © 2016年 apple. All rights reserved.
//

#import "KeyChainStore.h"

@implementation KeyChainStore

+ (NSMutableDictionary *)getKeychainQuery:(NSString *)service {

    return [NSMutableDictionary dictionaryWithObjectsAndKeys:

            (id)kSecClassGenericPassword,(id)kSecClass,

            service, (id)kSecAttrService,

            service, (id)kSecAttrAccount,

            (id)kSecAttrAccessibleAfterFirstUnlock,(id)kSecAttrAccessible,

            nil];

}


+ (void)save:(NSString *)service data:(id)data {

    //Get search dictionary

    NSMutableDictionary *keychainQuery = [self getKeychainQuery:service];

    //Delete old item before add new item

    SecItemDelete((CFDictionaryRef)keychainQuery);

    //Add new object to search dictionary(Attention:the data format)

    [keychainQuery setObject:[NSKeyedArchiver archivedDataWithRootObject:data] forKey:(id)kSecValueData];

    //Add item to keychain with the search dictionary

    SecItemAdd((CFDictionaryRef)keychainQuery, NULL);

}


+ (id)load:(NSString *)service {

    id ret = nil;

    NSMutableDictionary *keychainQuery = [self getKeychainQuery:service];

    //Configure the search setting

    //Since in our simple case we are expecting only a single attribute to be returned (the password) we can set the attribute kSecReturnData to kCFBooleanTrue

    [keychainQuery setObject:(id)kCFBooleanTrue forKey:(id)kSecReturnData];

    [keychainQuery setObject:(id)kSecMatchLimitOne forKey:(id)kSecMatchLimit];

    CFDataRef keyData = NULL;

    if (SecItemCopyMatching((CFDictionaryRef)keychainQuery, (CFTypeRef *)&keyData) == noErr) {

        @try {

            ret = [NSKeyedUnarchiver unarchiveObjectWithData:(__bridge NSData *)keyData];

        } @catch (NSException *e) {

            NSLog(@"Unarchive of %@ failed: %@", service, e);

        } @finally {

        }

    }

    if (keyData) CFRelease(keyData);

    return ret;

}


+ (void)deleteKeyData:(NSString *)service {

    NSMutableDictionary *keychainQuery = [self getKeychainQuery:service];

    SecItemDelete((CFDictionaryRef)keychainQuery);

}



@end